Machine for making heat transfer units



' Oct. 13, 1936.

H. F. MAYNES MACHINE FOR MAKING HEAT TRANSFER ,UNITS 7 Sheets-Sheet 1 Filed April 16, 1936 g g N WQE ma N wa. 5

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R O T N E V m I @lM-A mum Oct. 13, 1936. H. F. MAYNES v MACHINE FOR MAKING HEAT TRANSFER UNITS 7 Sheets-Sheet 2 Filed April 16, 1956 INVENTOR g hymF. Maynes,

TT RNEYS Oct. 13, 1936. H. F. MAYNES MACHINE FOR MAKING HEAT TRANSFER UNITS Filed April 16, 1936 7 Sheets-Sheet 3 BY fimnes, I ATTO Ru Oct. 13', 193 H, F, 'MAYNES 3 2,057,244

MACHINE FOR MAKING HEAT TRANSFER UNITS Filed April 16', 1936 lv'sheets-sheet 4 56 s3 01". 1% 00 L 10 "Y 8 g g w i i QQE, |/-J er 00a 0 00 INVENTOR Hyla EMaynes,

H. F. MAYNES MAUI- HE FOR MAKING HEAT TRANSFER UNITS Oct.- 13, 1936.

Filed April 16, 1936 '7 Sheets-Sheet 5 INVENTOR Kyla Maynes,

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MACHINE FOR MAKING HEAT TRANSFER UNITS Filed A ril 16, 1936 '7 Sheets-Sheet EHH .wmm

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, Qua, ATTORNEYS Patented Oct. 13, 1936 PATENT OFFICE I 2,057,244 MACHINE-FOR MAKING HEAT TRANSFER UNITS Hyla F. Maynes, North Tonawanda, N. Y., as-

signor of one-half to Emma C. Maynes, North Tonawanda, N. Y.

Application April 16, 1936, Serial No. 74,733

21 Claims.

This invention relates to the manufacture-of heat transfer units and it has particular relation to a machine for assembling elements of a heat transfer unit.

One object of the invention is to simplify the operations of assembling elements of heat transfer units and to insure improved positive connection of such elements incidentally to the I assembling thereof. a

Another object of the invention'is to provide an improved method of piercing "fins of the heat transfer unit'and assembling them, with pipe sections in a single operation.

Another object of the invention is to provide an improved strip feeding and cutting device which automatically supplies strip or fin sections to a strip holding jig and severe them 'to proper lengths, whereby they are in such posiv tion as to be pierced and secured to pipe sections. I

Another object of the invention is to provide an improved construction of jig coopera-ble with a strip feeding device for automatically'feeding strip .material into the jig and cutting such material to predetermined lengths.

Another object of the invention is to provide an improved construction of jig in which the fin strips are pierced and positively secured to pipe sections before removal of the assembled unit parts therefrom.

Another object of the invention is to provide a machine in which strip material is intermittently fed to a jig and cut to predetermined lengths and so held in the position corresponding to that occupied while servingas fins for a heat transfer unit that another mechanism of the machine can force pipe sections through the strip material to assemble the unit elements.

Another object of the invention is to provide an improved fin piercing and pipe assembling unit that is adapted to be operated in conjunction with a strip holding jig and with a strip feeding device.

Another object of the invention is to provide an improved fin feeding and cutting device.

In the drawingsi Fig. 1 is a fragmentary plan of a machine for cutting fin strips and assembling them with pipe elements according to the invention;

Fig. 2 isa fragmentary side elevation of the machine shown in Fig. ,1;

Fig. 3 is a fragmentary plan, on a larger scale, of a portion of the machine and illustrating the relationship of a strip piercing and cutting device to a strip receiving jig from which the upper 'section has been omitted;

Fig. 4 is a bottom plan of a strip feeding and cutting deviceincorporated in the machine;

Fig. 5 is a fragmentary vertical section, on a larger scale, taken substantially along the line V--V of Fig. 3;

Fig. 6 is a diagrammatic bottom plan of stri feeding rollers and associated elements of the machine;

Fig. 7 is a diagrammatic bottom plan similar to Fig. 6 and illustrating another position of the strip feeding rollers;

Fig. 8 is a fragmentary vertical section taken substantially along the line VIII--VIII of Fig. 1;

Fig. 9 is a. perspective, on a larger scale, of 1 blocks or frames for holding a strip cutter and for guiding strip material;

Fig. 10 is a perspective of a heat exchange unit which is a product of the machine shown in Fig. 1;

Fig. 11 is a fragmentary vertical section, on a larger scale, taken substantially along the line X--X of Fig. 3; and illustrating other structure beyond the section line;

Fig.- 12 is a fragmentary plan of a pipe section with piercing elements therein associated with a portion of an actuating device;

Fig. 13 is a fragmentary side elevation of the structure shown in Fig. 12;

Fig. 14 is a fragmentaryside elevation, on a larger scale, of an end portion of one of the piercing elements;

Fig. 15 is a fragmentary perspective of upper and lower plates which are recessed to form guides or slots;

Fig. 16 is a fragmentary vertical section, on a larger scale, taken substantially along the line XVIXVI of Fig. 8 and illustrating a structure for securing a pipe to a fin strip of a heat exchange unit;

Fig. 17 is a fragmentary side view partially in section and taken substantially along the line XVIIXVII of Fig. 16;

Fig. 18 is a fragmentary vertical section sim-\ sembled relationship between fins and pipes of a heat exchange unit;

Fig. 22 is a diagrammatic plan illustrating the manner in which a plurality of groups 'of fins can be. assembled with pipes for a heat exchange unit;

Fig. 23 is a side elevation of the structure shown in Fig. 22 after the pipes have been bent to bring the fin groups into juxtaposition;

Fig. 24 is a diagrammatic side elevation of a relatively long pipe section upon which spaced groups of fins can be attached according to the invention;

Fig. 25 is a cross section taken substantially along the line XXV-XXV of Fig. 24;

Fig. 26 is a diagrammatic side elevation of the structure shown in Fig. 24 after the pipe has been bent between adjacent groups of fins to form parallel groups of fins and pipe sections between the several bent portions;

Fig. 2'7 is a cross section, on a larger scale, taken substantially along the line XXVII- XXVII of Fig. 1;

Fig. 23 is a fragmentary bottom plan illus trating an automatically operable latch for controlling the carriage; and

Fig. 29 is a fragmentary side elevation of the structure shown in Fig. 28.

In practicing the invention, a supporting frame 50 of suitable material, such as metal, is provided with a platform 52 having rails or tracks 53 formed thereon. These tracks are V-shape in cross section and carry wheels or rollers 55 thereon of a traveling strip feeding and cutting device 60 which is in carriage form. The circumferential portions of the wheelshave V-shaped grooves 62 therein that correspond substantially to the shape of the tracks and serve to' guide the carriage 60 in a predetermined path of movement. and to prevent lateral displacement thereof. Suitable axles 63 are rotatably mounted in bearing lugs or brackets 65 provided on a horizontal body or frame plate 66 of the carriage.

A vertical flange 61 formed rigidly upon the outer side of the platform 52 is disposed parallel to the tracks 53 and is provided with a track 68 upon which a roller 69 is disposed for horizontal movement and for rotation about a vertical axis. A portion of the carriage frame plate 66 is extended and is in the form of a bifurcated bearing lug 10 which supports a vertical pin 12 upon which. the roller 69 is mounted for rotation. This roller 69 and flange 61 prevent lateral tilting of the carriage upon the tracks 53. Suitable stops 13 (Fig. 3) formed on the flange 61 in the path of the roller 69 limit movement of the carriage in opposite directions.

A suitable source of power, such as an electric motor 15 is bolted, as indicated at I6, to the frame plate 66 in such position that it operates about a vertical axis, and is provided with a suitable reduction gear housing 11 in which conventional reduction gearing (not shown) is encased. A driving shaft of the reduction gearing rotates in a bearing 82 formed in the frame plate 66 and rigidly supports a gear 83 which meshes with a second gear 85 carried rigidly upon a vertical shaft 86. A hearing 81 that forms a part of, and extends, through, the frame plate 66 carries the shaft 86. The second gear 85 engages a larger gear 88 which is rigidly carried upon a lower portion of a vertical shaft 89 mounted in a bearing 80 similar to the beara roller I02 mounted for rotation about a vertical axis upon a vertical pin I03 that is carried in the disk adjacent its periphery. A recess I05 formed in the circumferential portion of the disk I00 is so positioned that the roller projects from the disk edge and is between the planes of the opposite sides of the disk.

As the shaft 89 rotates the roller I02 has an intermittent camming action upon a dog or ratchet lever I06, one end portion of which has a slot I01 formed longitudinally therein for receiving a bolt I08 upon which the lever is pivotally supported, as well as having limited longitudinal bodily movement provided by the slot. The bolt I08 is rigidly secured in the frame plate 66, and the lever I06 is pivotal in substantially a horizontal plane. A U-shaped leaf spring I09 has one end connected to the bolt I08 and its other end connectedv in a notch IIO formed in the ratchet lever. The spring is constantly under tension and urges the lever longitudinally in a direction away from the bolt I08.

. A coil spring II2 has an .end connection I I3 with the ratchet lever I06 adjacent the outer end of the latter and has an opposite end connection I I5 with the frame plate 66. This spring I I2 is constantly under tension and tends to pivot the lever I06 in a clockwise direction, as viewed in Fig. 4. A stop lug or pin I I6 is rigidly carried upon the lower side of the frame plate 66 adjacent the outer end of the ratchet lever I06 and limits movement of the latter in its pivotal movement in the clockwise direction mentioned. The outer end of the ratchet lever is-in the form of an inclined tooth II8 which normally engages teeth H8 of a ratchet bar I20 carried rigidly upon an upright stationary wall I22 of the machine frame 50. The ratchet bar I20 is parallel to the tracks 53.

Upon rotation of the disk I00 the camming roller I02strikes the ratchet lever [-06 and pivots it a predetermined degree in a counter clockwise direction, as viewed in Fig. 4. Since the teeth of the ratchet bar I20 are stationary the carriage 60 is moved at intervals upon rotation of the disk I00. As soon as the camming roller I02 is moved away from the ratchet lever the tension spring II2 draws such lever again to its position against the stop I I6. During this movement the slot I01 permits longitudinal movement of the lever as its inclined end tooth II8 slides over the inclined surfaces defining the teeth I I9 of the ratchet bar I20. The carriage can thus be successively moved at intervals and the lever tooth II8 locks successively behind the teeth II9 of the stationary ratchet bar.

The disk I00 is also provided with a camming lug or pin I25 rigidly carried thereby and disposed in a plane offset from the plane of the roller I02. One end of a lever I26 is in the form of a cam I21 which is disposed in the path of the lug I25 and, by operation of the latter, is intermittently pivoted a predetermined degree during each revolution of the disk I00. The lever I26 has an intermediate pivotal support I28 carried upon a bracket I29 that is rigidly secured to the frame plate 66. The end of the lever opposite the cam end I2! is provided with a dog I30 pivoted thereto, as indicated at I32, and having an end tooth I33 for engaging teeth I of a ratchet bar I36 similar and parallel to the ratchet bar I20, as well as being rigidly connected in the same manner to the wall I22- of the machine frame. A guide I31, carried rigidly upon the. frame plate 66 ,slidably receives the dog i30 and/a coil spring I39 having an end connection I40 securing it to the lever, also has a similar opposite end connection I42 securing it to the frame plate 66. This spring is constantly under tension and urges the dog I30 into engagement'with the teeth I35 of the ratchet bar by pivoting the lever I26 ina counter clockwise direction, as viewed in Fig. 4.

During each revolution of the disk I00 the lug I25, in! a camming action, strikes the cam ,erated by the roller I02.

It will be observed that the ratcheting action upon the ratchet bars I20 and I36 is in opposite directions and, hence during intervals between actuation of the levers I06 and I26, the ratchet bars are positively engaged by action, of the levers to hold the carriage 60. firmly in a stationary position upon the tracks 53. This action continues until the end of a cycle of movement of the carriage.

When the carriage approaches the ends of the tracks, that is, in its movement to'the left, as viewed in Fig. 11, the inclined portion of end toothI I6 of the lever I06 rides upon a cam surface I45 (Fig. 28) which is a continuation of one of the ratchet teeth H8. The lever I06 is thus moved inwardly in a longitudinal direction toward its pivotal connection a greater distance than the normal distance it is moved by sliding over the teeth H9. ,The slot I01 is sufficiently long to permit this additional movement.

One end of a latch I66 has a pivotal connection I41 upon the stop H6 and is provided with an' offset dog or arm I48 which normally impinges upon an edge of the lever I06. As

the end of the lever I06 rides upon the cam surface I65 the dog I40 snaps into a notch I56 formed in the lever and locks the latter in a withdrawn position. A spring I52 having one end anchored in the stop II6, as indicated at I53, and providing means for preventing the latch from being displaced from its connection to the stop, has an opposite end portion I55 engaging an intermediate portion of the latch I46 and constantly urges the latter in a direction of engagement with the notch. This action of locking the lever I06 in a withdrawn position is automatic and occurs incidental to the travel of the carriage in one direction.

While the lever is held in locked position (Fig. 28), the carriage can be moved to a starting point adjacent the other end of the tracks 53, or atany place between its maximum limits of movement, and as the carriage approaches such starting position, an outer end portion I56 of the latch strikes a cam member I51 secured to the frame 50 adjacent the end of the ratchet bar. This action pivots the latch out of engagement with the notched portion of the lever and against the force exerted by the spring I52. The leaf spring I69 then urges the lever back to its operative position for engaging the teeth H9 in the manner previously described. After a cycle of operation commences, the end I56. of the latch is automatically disengaged from the cam member by sliding therefrom, and the dog I48 again rests against the edge of the lever I06.

It is to be understood that the cam member I51 can be connected at any of various positions within the path of movement of the latch and the position of the cam surface can be varied according to the distance it is desired that the carriage shouldtravel.

A roller body I60 is carried rigidly upon the upper end portion of the shaft 88 and is provided with a circumferential channel I62 dividing the body into an upper roller section I65 and a lower roller section I66. It is to be understood" that the roller sections can be constructed as separate elements and assembled into substantially the form shown. The lower roller section I66 circumferentially engages a disk-like cam section I61 of a roller body I10 that is also provided with an upper roller section I12 likewise normally engaging, or contiguous to, the upper roller section I65. vA cam lug I13 is formed upon the circumferential edge of the lower cam disk or roller section I66. A groove-or channel I15 registering or in alinement with the channel I62 is formed between the upper roller section I12and cam disk I61. For purposes of convenience the upper roller sections I65 and I12 are designated as feed rollers.

The roller body I16 is rotatably carried uponan upright bearing shaft I16 that is rigidly secured adjacent its lower end in a slide I11 that axial displacement of the roller bodies I60 and I10 from these shafts.

One extremity of the, slide I11 is provided with sockets I for receiving adjacent end portions of compression springs I86 and the other end portions of these springs are mounted upon lugs I81 provided rigidly upon a plate I88 that is integrally formed on, or is rigidly secured in an upright position along, one edge or end of the frame plate 66. The springs I86 are constantly under compression and urge the roller body I10 toward the roller body I60.

An upright guide wall I (Figs. 8 and 9) is rigidly mounted upon the upper side of the carriage frame plate 66 and is located substantially midway between the shafts 89 and I16 when I62 and I 15 provide space forreceiving an in-' termediate portion 202 of the wall in which the lower extremity of the guideway is formed. The strip of material is gripped between the feed rollers as they are rotated and in each revolution of these rollers the cam lug I13 strikes the rollersection I61 and momentarily separates the feed rollers. The strip material can be supplied from a conventional reel (not shown) upon which the material can be wound.

The operation of the cam lug I13 in separat ing the feed rollers is so timed that therollers .are separated during the period in which the outer side of the holder receives a flange 201 9 formed on the rear end of a cutter 205 and in such relation that the cutter can pivot outwardly about the connection of the flange in the vertical slot although the pivotal action is very slight. A portion of the outer face of the holder is cut away to form a shoulder 208 upon which the lower edge of the cutter rests. The cutter is provided with a vertical cutting edge 209 adjacent the exit of the guide I95 and a pair of coil springs 2I0 normally under compression are disposed in sockets 2I2 formed in the holder 204 and their outer ends impinge upon the inner side of the cutter. A cover plate 2I5 is secured along the upper edge of the holder 204 by means of fastening elements 2I6 to prevent the cutter from being displaced from the holder.

A jig 220 mounted upon a horizontalplatform 222 of the machine frame 50 comprises a series of lower plates 225 disposed on edge and side by side in such relation that their inner end edges are substantially coincidental with the path of movement of the cutter 205 as the carriage 60 travels upon the tracks 53. Suitable bolts or rods 226 extending through openings 221 in the plates and through ears 228 formed integrally on the frame 50, rigidly hold the plates in a stationary position.

An upper group of plates 230 arranged similarly to the plates 225 and in edge to edge relation thereto in a closed position of the parts of the jig 220 is provided with bolts or rods 232 extending through openings 233 in the upper plates and through ears 235 formed upon an upper horizontal plate holder 236 for the purpose of rigidly assembling the plates 230 with the holder. Guiding posts 238 extending rigidly from the holder in a downward direction have their lower ends disposed in guides 239 formed in the platform 222 of the machine frame and insure proper alining of the several lower and upper plates 225 and 230 in edge to edge relation when they are moved toward one another.

As best shown in Figs. 8, 11 and 15, each lowerplate-225is so formed as to have an upper relatively thin section 240 which is defined by shoulders 242, and the inner endof the plate is provided with an upright guard 243 having the same width asthe thinner section 240. Substantially semi-circular notches 245 are formed in regularly spaced relation along the upper margin of the narrower section.240. I

Likewise, each upper plate 230 is so formed as to have a lower relatively thin section 250 which is defined by shoulders 252, and the inner end of the plate is adapted to fit closely adjacent,

the inner surface of the upright guard 243 of the companion lower plate 225. Substantially semi-circular notches 255 are formed in regularly spaced relation along the lower margin of the thinner section 250 and these notches are registerable with the similar notches 245 of the lower plate tov define transverse substantially circular openings when companion plates 226 and 230 have been'moved together in opposed edge to edge relation and into approximate contact. I

After the plates 225 and 230 have been brought together in the relation shown in Fig. 11 the thinner sections 240 and 250, together with the shoulders 242 and 252, define a series of slots 256 into which the strip 200 is to be fed. The plates 225 and 230 are of such length that one revolution of the feed rollers feeds a section of the strip into one of the slots 256 a distance substantially equal to the circumference of one of the rollers minus the space required for the operation of the cam I13 that releases the strip from the grip of the feed rollers. The distance between the several slots 256 corresponds to the distance between. the teeth H9 or I 35 of the ratchet bars I 20 and I36. Each time the carriage 60 is released and moved by operation of the levers I06 and I26, the cutter edge 209 severs'the strip 200 by a shearing action in cooperation with an end corner 256 of one of the plates 225. Each upright guard defines a portion of the corner 258 and thus there is provided a continuous corner against which the entire width of the strip is pressed during each cutting operation. This operation is continued intermittently until as many of the slots 256 as desired are filled with sections or flns 259 of the severed strip. A stop strip or bar 251 rigidly secured along one side of the jig across the outer ends of the slots 256 prevents the strip sections from being disposed too far through the jig or from being accidentally displaced therefrom.

In the position of the jig parts as shown in Fig. 8, wherein the strip sections are fed into the slots 256 and cut to proper length, the contiguous edges of the companion plates 225 and 230 are not, in this phase of the operation, brought entirely into contact with one another, but suilicient space remains for additional later movement.

A piston and cylinder device 260 of conventional construction is operated by fluid pressure and is connected to the upper holder 236 of the jig by means of an actuating piston 262 of the device 260 to move the group of upper plates 230 toward or away from the lower plates. The piston and cylinder device 260 is carried upon a suitable stationary support 265. In order to gauge the plates so as to provide the slightly spaced relation between their edges, a portion of one or more of the upright guides 238 is formed with a recess 266 which defines a shoulder 261 and one end 268 of a lever 269 is engageable with the shoulder to provide a stop to arrest the downward movement of the plates 230. The lever 269 is pivoted upon a bolt 210 carried rigidly in the machine frame platform- 222. A stop 212 (Fig. 3) provided in the platform-adjacent thelever 269 is disposed in such position that, by pivoting the lever thereagainst, the latter is so positioned that its end will be disposed along the recessed portion of the guide post and will stop the latter by engagement with the shoulder 261. When further movement of the upper plates is desired the lever can be pivoted out of engagement with the guide post and then the edges of the upper and lower pla scan be brought together by the pressure deyl e. The purpose of this particular operation appears in,the description to follow.

8 A "strip piercing and pipe positioning device 280 is, disposed adjacent the constructon just described and is provided with a supporting platform 282 that forms a part of the main frame 50. Along the outer" extremity of the platform i 282 a pistonand cylinder actuating device 283 of conventional form' is rigidly mounted and has a pivotalconnecton 285 to a cross head 288 that is slidably mounted in guides 281 formed in the frame. l An actuating frame 288 has a pivotal connection 299 with the cross head 286 and includes a 'series of bars 290 rigidly assembled by means of strips 292 bolted, or similarly secured, transversely thereof. This frame can be pivoted to an inoperative position indicated by broken lines of Fig; 2. Each of the bars 290 is provided with opposite'laterally projecting slide members 293 and opposite upper and lower slide members 295 which impart a cross like cross sectional configuration (Fig. 27) to each bar.

Pairs of parallel channel guideways 295 formed in guide bars 291 slidably receive the slide members 293 of the bars andthese'guide bars are secured upon the platform 282 to form 30 a guide frame 298. The upper surface of each upper slide member 290 is disposed snugly between opposed upper edges of the channel bars 291. Thus the actuating frame 288 is adapted to be slidably moved into interfitting relation with the guiding frame 29a.

The end of each bar 290 is provided with a l recess 299 that corresponds substantially in shape to the bight portion 300 of a pipe section 302 that has been bent to provide two parallel 40 leg portions 303 joined by the bight. Rods 305 are inserted into the parallel leg portions 303 of the pipesection and shoulders 306 formed adjacent the outer end portions of the rods abut against the outer ends of such leg portions. Fin piercing heads 308 are provided integrally upon the ends of the rods and are slightly larger in diameter than the diameter of the pipe. A series of blades 309 is formed longitudinally of each rod upon a pointed or conical end surface 3l0 of the head. vThese blades are spaced substantially uniformly about the circumference of the conical end.

A series of pipes 302 with the rods 305 disposed therein in the manner shown in Fig. 12 are then inserted into the guideways 296, while the actuating frame is in the broken line position shown in Fig. 2. After the guide frame 298 has been filled with pipe sections having piercing rods disposed therein inthe manner shown in Figs. 1 and 12, the frame 288 is pivoted to approximately the full line position shown in Fig. 2 and, in this position, the recesses 299 in the ends of the bars 290 are aligned with the bight portions 300 of the pipe sections. Then the 5 cross head 286 is actuated by the fluid pressure device to move the pipe sections longitudinally through the guide frame 298. During this movement the channel guideways 298, together with the rods 305 in the pipes, prevent displacement 70 or buckling of the latter.

A series of arcuate bars 3l5 is pivotally mounted upon a hinge pin 3l6. mounted transversely in ears 3" of the end portion of the guide frame opposite the frame 238 and these 75 bars have their intermediate portions curved from between the pipe sections. This arrangement provides for additional guard against buckling of the pipe sections.

The guide frame 298 is so positioned with respect to the jig 220 that the channel guide-- ways 298, and hence, the leg portions of the pipe sections disposed therein register, or are aligned with, the openings formed by'the recesses 245 and 255 in the plates 225 and 230.

After a series of strip sections have been inserted in the slots 255 of the jig by operation of the feeding and cutting device 50 and the parts of the jig are in substantially the relation shown in Fig. 8, the fluid pressure device 283 is operated to force the pointed heads 308 of the piercing rods carried in the pipe sections in such manner as to pierce the strip sections and until the pipe sections are disposed therethrough in the manner shown in Fig. 21. This operation pointed end surface of the rod heads.

As best shown in Figs. 16 and 17, the metal at the location'of the openings formed by the piercing rods is forced aside to form flanges 320 that are then disposed between the outer surface of the pipes and the inner circumferential surfaces defining the openings 245 and 255.

Then the lever 269 is actuated to release the guiding posts 238 and additional pressure applied to the upper section of the jig 220 by the fluid pressure device 280 to move the upper and lower plates together in opposed relation. This action slightly indents the metal of the pipes, as indicated at 322, and provides a positive connection between each pipe section and the strip fins 259. The fins are thus crimped to the pipe sections. The piercing rods' are withdrawn from the pipes before the jig is opened and then the upper section of the jig, including the plates 230, is withdrawn to permitremoval of the assembled fins and pipes which can be lifted bodily punch and receives a cam rod 328 that also has an eccentric portion or cam 329 disposed in the opening. Upon rotation of the cam rod in openings 330 formed through the plates 225 and 230, each punch 325 is fcrced toward the fin flange 320 and projections 332 formed on the-inner end of each punch slightly upset the metal of the fin and pipe to form crimped or beaded sections 333 that provide for positive connection of the fins to the pipes. a v

Each cam rod 328 is provided with a lever 335 pivotally connected in parallelism by means of linkage 335'to the adjacent lever 335 and An eccentric 7 opening 321 is formed in the outer end of each is facilitated by the blades 309 formed on the g one of the levers is provided with an actuating handle 340 by which the cam rods can be rotated concurrently to perform the operation just described. In this arrangement the plates-can be brought to such position as to have their opposed edges in substantial contact and then the stop lever 268 and shoulder 281 of the guide post will not be necessary. It is to be understood that in such case the openings or recesses 245 and 255 are formed of such, size that there will be suilicient clearance between the pipe sec- ,tions 302 and plates at the openings to permit;

slotted, as indicated at 343, to receive the pipesections 305 and are then soldered, or otherwise I secured rigidly to the pipe sections.

In order to provide continuous sinuous piping, U-shaped bight sections 345 are secured to the ends of the pipe sections 302 in alternate relation to the bight portions300 of the original pipe sections. It will be noted that the outer pipe sections or legs (Fig. 21) are extended, as indicated at 348, to facilitate connection of the assembly to fluid sources used in operating the heat exchange units.

It is to be understood that the length of the fin strip 250 to be severed can be varied by changing the size of the feed rollers I85 and I12, or by providing a plurality of cam rollers, such as the roller I02, on the cam disk I00. together with a plurality of cam pins, such as the pin I25, and arranged in the same manner to operate the levers I06 and I26 more than once for each revolution of the disk. In like manner, more than one cam corresponding to the cam I13, can be applied to the roller section I81. Since these arrangements appear to .be obvious from the disclosure already described,

a detailed showing thereof is not necessary.

It may be desirable to feed the strip in such manner as to provide a plurality of groups 350 of fins (Fig. 22) and wherein more than one jig is required, or a more extensive number of plates 225 and 230 arranged in groups may be necessary. In such instance, relatively long sections of pipe 302, like those shown in Fig. 22, can be forced through the several groups of fin sections 259 in substantially the same manner .as that previously described. Under such circumstances, the frames 288 and 208 can be made as long as desired and piercing rods 305 commensurate with the length of the pipe sections can be used. The pipe sections after assembly with the fin sections can then be bent, as indicated at 355, to form a unit 358 having a plurality of groups of fins arranged in successive tiers in the manner shown in Fig. 23.

If it is desired to feed the strip 200 in such manner as to provide fin sections 351, each of which traverses only one section of pipe toform an assembly of the kind shown in Figs. 24, 25 and 26,'a relatively long section of .unbent pipe 358 is provided with a piercing rod 305 of proper length and is forced through sections of fins held in the jig. Under such circumstances, the

frames 288 and 298 can be made to accommodate the length of pipe as long as necessary and the operation of the machine proceeds in substantially the same manner as that already described. The jig 220, of course, can be provided with a plurality of groups of plates to accommodate the several groups of fins shown in Figs. 22 and .25.

After assembly with the fin sections, .the pipe 358 can be bent alternately, as indicated at 358,

Although more than onerform of the invention has been shown. and described in detail, it will be apparent to those skilled in the art that the invention is not limited to such forms, but that other structures embodying the invention can be designed from the disclosure without departing from the spirit of the invention or from the scope of the appended claims.

I claim:

1. An apparatus comprising a sectional jig having an opening formed in adjacent jig sections for holding a,strip of sheet material therein, means for feeding the strip material into the opening, means for piercing the strip material and concurrently forcing a pipe section therethrough, and means for opening the jig whereby the assembled strip and pipe are presented for bodily removal.

2. An apparatus comprising a sectional jig having an opening formed in adjacent jig sections for holding a strip of sheet material therein, means for feeding the strip material into the opening, means for piercing the strip material and concurrently forcing a pipe section therethrough, means in the jig for interlocking portions of the pierced strip to the pipe section after the piercing action, and means for opening the jig whereby the assembled strip and pipe are presented for bodily removal.

3. An apparatus comprising a jig having means for holding strip sections of material in spaced substantially parallel relation, means for feeding strip sections of the material to the jig in their spaced substantially parallel relation,

means in the strip feeding means for cutting the strip sections to predetermined lengths according to the rate of feeding the strips to the jig, and means for concurrenly punching the strip sections and disposing pipe sections therethrough to form a heat transfer unit, and means for opening the jig to facilitate removal of the assembled pipe and strip sections therefrom.

4. An apparatus comprising a sectional jig having openings formed in adjaceniajig sections for holding strips of sheet material in spaced substantially parallel relation, means for feeding strips of the material into the jig openings,

- ing strips of the material into the jig openings,

means in the first mentioned means for severing the strips to predetermined lengths incidental to the feeding thereof to the jig openings, means for intermediately piercing the strips in the jig and concurrently forcing pipe sections through 2,057,244 the strips to form a heat transfer unit, means for further securing the pipe sections and strips 3 together positively while remaining in the jig,

' severing the strips to predetermined length in and means for opening the jig to facilitate the removal of the assembled pipe sections and strips response to the operation of the feeding means, means for intermediately piercing the strips in the jig and concurrently forcing pipe sectionsthrough the strips to form a heat transfer unit, means for crimping the strip material to the pipe sections while they, are in the jig, and

means for separating sectional portions of the jig whereby in separated relation of the jig parts the assembled heat transfer unit is bodily removable therefrom.

'7. An apparatus comprising a jig having an upper section, said jig having a lower section, means for moving one of the sections toward and away from the other section, said upper and lower sections having registering recesses arranged in spaced parallel relation, said -reg istering recesses constituting guides for receiving strip material, means for feeding strip material into the guides of the jig, means for severing the strip material into predetermined lengths as the material is fed to the jig, means for intermediately'piercing the lengths of strip material in the jig and concurrently forcing pipe sections through the strip material'to form a heat transfer unit removable from the jig upon separation of the jig sections.

8. An apparatus comprising a jig having an upper section, said jig having a lower section, means for moving one of the sections toward and away from the other section, releasable means incorporated .in the jig structure to stop movement of said one of the sections toward the other section at predetermined relative positions thereof, said upper and lower sections having registering recesses arranged in spaced parallel relation, means for feeding strip material into the recesses of the jig, means for severing the strip material into predetermined lengths as the material is fed to the jig, means for transversely piercing the strip material in the several recesses and concurrently forcing pipe sections through the strip material to form a heat transfer unit removable from the jig upon separation of the jig sections, said jig sections being movable against portions of the assembled strip material and pipe sections to crimp them together upon release of the releasable means.

9. An apparatus comprising a jig having upper and lower relatively movable sections, interfitting guides in the sections to maintain predetermined guided relation between the sections, said guides having releasable stop means for limiting movement of one section toward the other, said stop means being releasable to permit unimpeded movement of the one section toward the other, said jig having recesses communicating from one section to the other when the sections are adjacent each other and when held .in predetermined relation' by the stop means, means for feeding fin sections into the recesses and severing them to predetermined lengths therein, means for piercing the fin sections and concurrently disposing pipe sections therethrough.

, 10; An apparatus comprising a jighaving upverselv and longitudinally .to'provide transverse and longitudinal openings extending through the jig, the plates of the upper section being normally disposed substantially in edge to edge relationwith the lower plates respectively, means for feeding strip material longitudinally into the longitudinal openings of the jig, means for severing the strip material into predetermined-lengths as it is fed to the jig, means for concurrently forcing piercing elements and pipe sections transversely through the jig openings and through the strip. material in the jig, means for crimping the pipe sections to the strip material while remaining in the jig, and means for separating the jig sections whereby the assembled pipe sections and strip material is removable as a unit therefrom.

11. In a machine for making heat transfer units, a jig having two companion sections, said jighaving a series of spaced parallel openings for receiving strip material, the dividing plane of the two companion sections intersecting each opening, a strip feeding device movable along one side of the jig in proximity to the openings, means in said device for intermittently feeding strip material into the several openings of the jig, means for intermittently moving the device a distance corresponding to the distance between the spaced openings of the jig, and means in the jig and device and responsive to movement of the latter for severing the strip material after each intermittent feeding operation.

12. In a machine for making heat transfer units, a jig having upper and lower sections, said jig having a series of spaced parallel openings for receiving strip material, the dividing plane of the upper and lower sections intersecting each opening, a strip feeding device movable along one side of the jig in proximity to the openings, means in'said device for intermittently feeding strip material into the several openings of the jig, means for intermittently moving the jig distances corresponding to the distance between the spaced openings of the jig and in timed relation with the feeding means, and means in the jig and device and responsive to movement of the latter for severing the strip 1 'material after each intermittent feeding operation, said last mentioned meansdncluding a shearing edge on the jig and extending substantially along the entrance to each opening and traversing a portion of each section.

13. In an apparatus for making heat transfer between the guides, means associating the strip feeding means with the actuating means whereby the feeding means registers with the guides .for intermittently feeding the strip material therein, and means associated with the jig and carriage and responsive to movement of the latter for severing the strip material after each intermittent feeding operation.

14. In an apparatus for making heat transfer units, a jig having a series of spaced parallel guides for receiving strip material fed thereto,

, per and lower sections, a series of plates arranged in side by side relation included in each .j'ig section, each plate being recessed transfor intermittently feeding the strip material therein, means for locking the carriage during each feeding operation, and means associated with the jig and carriage and responsive to movement of the latter for severing the strip material after each intermittent feeding opera tion.

15. In an apparatus for making heat transfer units, a jig having a series of spaced parallel guides for receiving strip material fed thereto, a carriage having means for guiding it along one side of the jig adjacent the entrances to the guides, strip feeding mechanism carried upon the carriage, actuating means for intermittently moving the carriage according to the distance between the guides, means associating the strip feeding means with the actuating means where- 'by the feeding means registers with the guides for intermittently feeding the strip material therein, means for locking the carriage during each feeding operation, means connected to the carriage for automatically releasing the locking means after the carriage has been moved to a predetermined distance, and means associated with the jig and carriage and responsive to movement of the latter for severing the strip material after each intermittent feeding operation.

units, a jig having fin holding guides therein, means for feeding blank fins into the guides, said jig having punch receiving guides intersecting the fin holding guides, a punching mechanism having guideways registering with the punch receiving guides, punching elements movable in the guideways and adapted to supportpipe sections thereon, and means in the punching mechanism for forcing the punching elements with pipe sections thereon through the punch receiving guides and through the fins held in the jig to assemble the fins and pipe sections.

' 17. In an apparatus for making heat transfer units, a jig having fin holding guides therein, means for feeding blank fins into the guides, said jig having rod receiving guides traversing the fin holding guides, a punching mechanism having guideways registering with the rod receiving guides, punching rods movable in the guideways and adapted to carry pipe sections telescoped therewith, and means in the punching mechanism for forcing the punching rods with pipe sections telescoped therewith through the rod receiving guides and through the fins to assemble the fins with the pipe sections.

16. In an apparatus for making heat transfer 18. In an apparatus for making heat transfer units, a jig having fln holding guides therein, means for feeding fins into the guides, said jig having rod receiving guides traversing the fin holding guides, a punching mechanism having guideways registering with the rod receiving guides, punching rods having tapered cutting heads and adapted to receive pipe sections telescoped therewith, means for forcing the rods with pipe sections thereon through the guideways and through the rod receiving guides, of the jig, whereby the fins are concurrently pierced and assembled with the pipe sections.

19. In an apparatus for making heat transfer units, a jig having fin holding guides therein, means for feeding fins into the guides, said jig having rod receiving guides traversing the fin holding guides, a punching mechanism having means for supporting it adjacent the jig, a guide frame having pairs of guideways registering with the rod receiving guides of the jig, pairs of punching rods carried in the guideways and adapted to be telescoped with U-shaped sections of pipes, an actuating frame having members movable through the guideways for forcing the rods with pipe sections thereon through the rod receiving openings of the jig and through the fins in the jig.

20. In an apparatus for making heat transfer units, a jig having fin holding guides therein, means for feeding fins into the guides, said jig having punch receiving guides traversing the fin holding guides, a punching mechanism carried adjacent the jig, a guide frame having pairs of guideways registering with the punch receiving guides of the jig, punching elements carried in the guideways and assembled with pipe sections,

an actuating frame having means for pivotally supporting it adjacent the guide frame, and means for moving the guide frame through the guideways, whereby the punching elements with pipe sections thereon are forced through the punch receiving guides and through the fins in the jig.

21. In an apparatus for making heat transfer units, a jig having fin holding guides therein, means for feeding fins into the guides, said jig having punch receiving guides traversing the fin holding guides, a punching mechanism having guideways registering with the punch receiving guides, punching elements movable in the guideways and adapted to support pipe sections thereon, pivotal members lying between the guideways and supported by the punching mechanism to prevent buckling of the punching elements, and means in the punching mechanism for forcing the punching elements with pipe sections thereon through the punch receiving guides and through the fins held in the jig, said last mentioned means engaging the pivotal members for pivotal displacement of the latter during the operation of the punching mechanism.

HYLA F. MAYNES. 

